The Ruinenberg is a hill in the Bornstedt borough of Potsdam, located north of Sanssouci Park. In 1748, the Prussian king Frederick the Great had a water tank with a capacity of around 7600 m³ built on top to supply the Sanssouci water features, and had it decorated with artificial ruins. From 1841 a surrounding landscape garden was laid out at the behest of King Frederick William IV of Prussia, according to plans designed by Peter Joseph Lenné.